242281 has 4 divisors (see below), whose sum is σ = 260932. Its totient is φ = 223632.

The previous prime is 242279. The next prime is 242309. The reversal of 242281 is 182242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182242 = 2 ⋅91121.

It can be written as a sum of positive squares in 2 ways, for example, as 11881 + 230400 = 109^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 242281 - 2¹ = 242279 is a prime.

It is a super-2 number, since 2×242281² = 117400165922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9306 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (65233).

2²⁴²²⁸¹ is an apocalyptic number.

It is an amenable number.

242281 is a deficient number, since it is larger than the sum of its proper divisors (18651).

242281 is a wasteful number, since it uses less digits than its factorization.

242281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18650.

The product of its digits is 256, while the sum is 19.

The square root of 242281 is about 492.2204790538. The cubic root of 242281 is about 62.3409073762.

The spelling of 242281 in words is "two hundred forty-two thousand, two hundred eighty-one".